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SPX431A,B,C Precision Adjustable Shunt Regulator
FEATURES * Trimmed Bandgap: 0.5%, 1% and 2% * Wide Operating Current: 1mA to 150mA * Extended Temperature Range: 0C to 105C * Low Temperature Coefficient: 30 ppm/C * Improved Replacement in Performance for TL43 * Low Cost Solution * Available in Lead Free, RoHS compliant packaging: SOIC, SOT-89, SOT-23-3, SOT-23-5, and TO-92 APPLICATIONS * Battery Operated Equipment * Adjustable Supplies * Switching Power Supplies * Error Amplifiers * Single Supply Amplifier * Monitors/VCRs/TVs * Personal Computers
DESCRIPTION The SPX43 is a three-terminal adjustable shunt voltage regulator providing a highly accurate bandgap reference. The SPX431 acts as an open-loop error amplifier with a 2.5V temperature compensation reference. The SPX431 has thermal stability, wide operating current of 150mA and broad temperature range of 0C to 150C, making it suitable for a variety of applications which require a low-cost, high performance solution. SPX431A tolerance of 0.5% is proven to be sufficient to overcome all other errors in the system to virtually eliminate the need for trimming in the power supply manufacturer's assembly line and contribute a significant cost savings. The output voltage may be adjusted to any value between VREF and 36 volts with two external resistors. The SPX431 is available in SOIC-8, SOT-23-3, SOT-23-5, SOT89, and TO-92 packages. TyPICAL APPLICATIONS CIRCUIT
Cathode (K)
Reference (R)
+ 2.5V
Anode (A)
Rev F: Nov 2-06 SPX43A,B,C Precision Adjustable Shunt Regulator (c) 2006 Sipex Corporation
ABSOLUTE mAXImUm RATINGS
Cathode-Anode Reverse Breakdown Vka ......................................37V Anode-Cathode Forward Current, (<10ms) Iak ................................A Operating Cathode Current Ika ..................................................150mA Reference Input Current Iref ......................................................0mA Continuous Power Dissipation at 25C Pd SOIC-8 .....................................................................750mW SOT-23-5 ................................................................200 mW SOT-23-3 ................................................................47 mW SOT-89 ..................................................................000mW\ TO-92 .......................................................................775mW Junction Temperature Tj ........................................................... 150 C Storage Temperature Tstg ...............................................-65 to 150 C
NOTE: Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.
RECOmmENDED CONDITIONS
PARAmETER SymBOL Cathode Voltage VKA Cathode Current IK RATING VREF to 36 0 UNIT V mA
TyPICAL ThERmAL RESISTANCES
PACKAGE SOIC-8 TO-92 SOT-89 OJA OJC TyPICAL DERATING 5.7 mW/C 6.3 mW/C 9.1 mW/C 1.7 mW/C 3.3 mW/C 124.8C/W 45C/W 131.9C/W 80C/W 107.1C/W 8C/W
SOT-23-5 191C/W 150C/W SOT-23-3 300C/W 136C/W
Typical deratings of the thermal resistances are given for ambient temperature >25.
ELECTRICAL ChARACTERISTICS
Parameter Symbol Test Conditions
Electrical characteristics at 25C Ik = 10mA Vk = Vref, unless otherwise specified.
Test Circuit min Reference Voltage VREF TC Vref Vk IREF IREF IK(MIN) IK(OFF) ZKA VREF = 0V, VKA = 36V fZ = 1kHz IK = 1 to 150mA TJ = 0C to 105C VREF to 10V 10V to 36V TJ = 0C to 105C -2.7 -2 SPX431A Typ max min SPX431B Typ max min SPX431C Typ max 2.545 V V mV/ C mV/ V A A mA nA Unit
2.490 2.515 2.470 2.520 2.503 2.495 2.445 2.495 2.469 2.536 2.449 2.541 0.07 -.0 -0.4 0.7 0.4 0.4 0.04 0.15 0.20 -2.7 -2.0 0.07 -.0 -0.4 0.7 0.4 0.4 0.04 0.15 0.20 -2.7 -2 0.07 -.0 -0.4 0.7 0.4 0.4 0.04 0.15
VREF with Temp. Ratio of Change in VREF to Cathode Voltage Reference Input Current IREF Temp Deviation Min IK for Regulation Off State Leakage Dynamic Output Impedance
0.20
2 2 2
0.3 4 .2 250 0.5
0.3 4 .2 500 0.5
0.3 4 .2 000 0.5
3
Rev F: Nov 2-06
SPX43A,B,C Precision Adjustable Shunt Regulator
(c) 2006 Sipex Corporation
2
CALCULATING AvERAGE TEmPERATURE COEFFICIENT (TC)
ppm/C 0
%/C 0
mV/C 0
DVREF D
TC in mV/C =
DVREF (mV) DTA
-10 5000 0.5
TC in % /C =
(
DVREF
DVREF at 25C DTA
)
x 100
0
15
30
45
60
75
90
105
TC in ppm/C =
(
DV REF DVREF at 25C DTA
)
x 106
Junction Temperature (C)
0.07 mV/C 0.003 %/C 27 ppm/C
Figure 1. Vref VS Temperature.
PACKAGE PINOUTS
8-Pin Surface Mount (S)
CATHODE ANODE ANODE N/C 1 2 3 4 8 7 REF ANODE ANODE N/C
SOT-23-5 (M5)
REF 5 4 2 3
SOT-89 (M1)
ANODE
TO-92 (N)
1 2 3
SOT-23-3 (M)
ANODE 3
SPX431
SPX431
1
SPX431
1 2 3 REF ANODE CATHODE 1
6 5
SPX431
2
N/C N/C CATHODE
REF ANODE CATHODE
CATHODE
REF
Top View
Top View
Top View
Bottom View
Top View
TEST CIRCUITS
VIN VKA = VREF
VIN VKA
VIN
VKA
IK (OFF) IREF IK
R1 (VREF) R2 IREF IK
Test Circuit . Test Circuit for Vka = Vref
Test Circuit 2. Test Circuit for Vka > Vref
Test Circuit 3. Test Circuit for Ikoff
Rev F: Nov 2-06
SPX43A,B,C Precision Adjustable Shunt Regulator
(c) 2006 Sipex Corporation
3
TyPICAL PERFORmANCE ChARACTERISTICS
150 125 100
2.53
VKA = VREF Temperature Range: 0C to 105C
2.52 VREF Reference Voltage (V) 2.51 2.50 2.49 2.48 2.47 2.46 2.45 -60
VKA = VREF IK = 10mA
IK - Cathode Current (mA)
75 50 25 0 -25 -50 -75 -100 -2 -1 0 1 2 3
VKA - Cathode Voltage (V)
-30 0 30 60 90 TA Ambient Temperature (C)
120
High Current Operating Characteristics
Reference Voltage vs. Ambient Temperature
900
VKA = VREF 0 to 105C
3.0
IREF Reference Input Current (A)
800 700
2.5 2.0 1.5 1.0 0.5 0 -60
R1 = 10k R2 = IK = 10mA
IK Cathode Current (A)
600 500 400 300 200 100 0 -100 -200 -1.0 0 1.0 2.0 VKA Cathode Voltage (V) 3.0
105C 25C -0C
-30 0 30 60 90 TA Ambient Temperature (C)
120
Low Current Operating Characteristics
Reference Input Current vs. Ambient Temperature
0
70 60
0C
Noise Voltage nV//Hz
-10
50 40 30 20 10 0 VKA = VREF IK = 10mA TA = 25C
VREF (mV)
-20
25C 75C
-30 IKA = 10mA -40
125C
-50 0
3
6
9
12 15
18
21
24
27 30
VKA Cathode Voltage (V)
f Frequency (Hz)
Reference Voltage Line Regulation vs, Cathode Voltage and Tambient
Rev F: Nov 2-06
Noise Voltage vs. Frequency
SPX43A,B,C Precision Adjustable Shunt Regulator
(c) 2006 Sipex Corporation
4
TyPICAL PERFORmANCE ChARACTERISTICS (continued)
0.150 0.125 0.100 0.075 0.050 0.025 0.0 -60 -30 0 30 60 90 TA Free Air Temperature 120
VKA = VREF IK = 1 to 100mA f1kHz
60dB 50dB 40dB 30dB 20dB 10dB 0dB -10dB -20dB -30dB -40dB 10
GAIN PHASE
REF LEVEL 60.000dB 0.0deg
/DIV 10.000dB 45.000deg
MARKER 19 422 611.000Hz MAG (A/R) -0.125dB MARKER 19 422 611.000Hz PHASE (A/R) 46.717deg 215 180 135 90 45 0 -45 -90 -135 -180 -215
100
1K
10K
100K
1M
10M
START 10.000Hz
STOP 50 000 000.000Hz
Low Frequency Dynamic Output Impedance vs. Tambient
Small Signal Gain and Phase vs. Frequency; Ik = 0mA, Ta = 25C
VOUT 15k 230
VIN
9F
IK
VOUT
VIN
8.25k GND
Test Circuit for Gain and Phase Frequency Response
Fz = 100kHz, Ik = 0mA, Ta = 25C
VIN 250
IK Cathode Current (mA)
100 90
A: VKA = VREF B: VKA= 5V at IK=10mA C: VKA=10V at IK=10mA D: VKA=15V at IK=10mA C
VOUT IK fp = 100kHz 50
80 70 60 50 40
STABLE
30 20 10 0 100
TA = 25C B
A
STABLE
D
101
102
103
104
105
106
107
GND Test Circuit for Pulse Response
CL Load Capacitance (pF)
Stability Boundry Conditions
Rev F: Nov 2-06
SPX43A,B,C Precision Adjustable Shunt Regulator
(c) 2006 Sipex Corporation
5
TyPICAL PERFORmANCE ChARACTERISTICS (continued)
100
150 W IK R
ZKA - Dynamic Impedance ()
TA = 25 C IK =1 to 100mA
10
CL
1.0
10k
0.1
0.01 1K 10K 100K 1M 10M
f Frequency (Hz)
Test Circuit for Stability
Dynamic Output Impedance Ta = 25C, Ik = to 00mA
100
VIN
R3
VOUT
IKOFF Cathode Current (nA)
10
VKA = 36V VREF = 0V
1
R1 0.1% VREF
SPX431A,B,C
0.1
R2 0.1%
0.01 -50 0 50 100 150
TA Ambient Temperature (C)
Off-State Leakage
Shunt Regulator Vout = (1+R1/R2)Vref
VIN ISINK R2
VOUT
R3
Q1
Isolated Feedback
Opto Isolator
R1 0.1%
R3 sets feedback gain, C1 provides feedback compensation
SPX431A,B,C R1 0.1%
C2 +
C1
SPX431A,B,C VOUTRTN
R2 0.1%
Constant Current, Sink, Isink = Vref/R1
Reference Amplifier for Isolated Feedback in Off-Line DC-DC Converters
Rev F: Nov 2-06
SPX43A,B,C Precision Adjustable Shunt Regulator
(c) 2006 Sipex Corporation
6
TyPICAL PERFORmANCE ChARACTERISTICS (continued)
VIN R5 R4
VIN
VOUT
R1 0.1%
R3
C1 SPX431A,B,C
R1 0.1% R2 0.1%
R3 VOUT
R2 0.1% SPX431A,B,C
Q1
Figure 23. Precision High Current Series Regulator Vout = (1+R1/R2)Vref
Figure 24. High Current Shunt Regulator Vout = (1+R1/R2)Vref
* Resistor values are chosen such that the effect to Iref is negligible.
VCC
R2
VIN
R1
VOUT
SPX431A,B,C
Figure 25. Single Supply Comparator with Temperature Compensated Threshold. Vin Threshold = 2.5V
Rev F: Nov 2-06
SPX43A,B,C Precision Adjustable Shunt Regulator
(c) 2006 Sipex Corporation
7
PACKAGE: 8 PIN NSOIC
Rev F: Nov 2-06
SPX43A,B,C Precision Adjustable Shunt Regulator
(c) 2006 Sipex Corporation
8
PACKAGE: 5 PIN SOT-23
Rev F: Nov 2-06
SPX43A,B,C Precision Adjustable Shunt Regulator
(c) 2006 Sipex Corporation
9
PACKAGE: 3 PIN SOT-89
Rev F: Nov 2-06
SPX43A,B,C Precision Adjustable Shunt Regulator
(c) 2006 Sipex Corporation
0
PACKAGE: 3 PIN TO-92
Rev F: Nov 2-06
SPX43A,B,C Precision Adjustable Shunt Regulator
(c) 2006 Sipex Corporation
PACKAGE: 3 PIN SOT-23
Rev F: Nov 2-06
SPX43A,B,C Precision Adjustable Shunt Regulator
(c) 2006 Sipex Corporation
2
ORDERING INFORmATION PART NUmBER ACCURACy OUTPUT vOLTAGE PACKAGE SPX431AM5 .........................0.5% ..................... 2.503V ..........................5-Pin SOT-23 SPX431AM5/TR....................0.5% ..................... 2.503V ..........................5-Pin SOT-23 SPX43AM .........................0.5% ..................... 2.503V ..........................3-Pin SOT-89 SPX431AM1/TR....................0.5% ..................... 2.503V ..........................3-Pin SOT-89 SPX43AS ............................0.5% ..................... 2.503V ............................. 8-Pin SOIC SPX431AS/TR ......................0.5% ..................... 2.503V ............................. 8-Pin SOIC SPX43AN ............................0.5% ..................... 2.503V ............................ 3-Pin TO-92 SPX43AM ...........................0.5% ..................... 2.503V ..........................3-Pin SOT-23 SPX431AM/TR......................0.5% ..................... 2.503V ..........................3-Pin SOT-23 SPX431BM5 .........................1.0% ..................... 2.495V ..........................5-Pin SOT-23 SPX431BM5/TR....................1.0% ..................... 2.495V ..........................5-Pin SOT-23 SPX43BM .........................1.0% ..................... 2.495V ..........................3-Pin SOT-89 SPX431BM1/TR....................1.0% ..................... 2.495V ..........................3-Pin SOT-89 SPX43BS ............................1.0% ..................... 2.495V ............................. 8-Pin SOIC SPX431BS/TR ......................1.0% ..................... 2.495V ............................. 8-Pin SOIC SPX43BN ............................1.0% ..................... 2.495V ............................ 3-Pin TO-92 SPX43BM ...........................1.0% ..................... 2.495V ..........................3-Pin SOT-23 SPX431BM/TR......................1.0% ..................... 2.495V ..........................3-Pin SOT-23 SPX431CM5 .........................2.0% ..................... 2.495V ..........................5-Pin SOT-23 SPX431CM5/TR ...................2.0% ..................... 2.495V ..........................5-Pin SOT-23 SPX43CM .........................2.0% ..................... 2.495V ..........................3-Pin SOT-89 SPX431CM1/TR ...................2.0% ..................... 2.495V ..........................3-Pin SOT-89 SPX43CS ............................2.0% ..................... 2.495V ............................. 8-Pin SOIC SPX431CS/TR ......................2.0% ..................... 2.495V ............................. 8-Pin SOIC SPX43CN............................2.0% ..................... 2.495V ............................ 3-Pin TO-92 SPX43CM ...........................2.0% ..................... 2.495V ..........................3-Pin SOT-23 SPX431CM/TR .....................2.0% ..................... 2.495V ..........................3-Pin SOT-23
Available in lead free packaging. To order add "-L" suffix to part number. Example: SPX431AM5/TR = standard; SPX431AM5-L/TR = lead free /TR = Tape and Reel TR pack quantity is 3000 for SOT-23-3, 2500 for SOT-23-5, SOT-89 and NSOIC, and 2000 for TO-92 in ammo pack.
Sipex Corporation headquarters and Sales Office 233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600 Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others.
Rev F: Nov 2-06
SPX43A,B,C Precision Adjustable Shunt Regulator
(c) 2006 Sipex Corporation
3

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